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Abstract #1825

Quadrifilar Helical Antenna as a Whole-Body Traveling-Wave RF Coil for 3T and 7T MRI

Branislav M. Notaros 1 , Milan M. Ilic 1 , Alexey A. Tonyushkin 2 , Nada J. Sekeljic 1 , and Pranav Athalye 1

1 Department of Electrical and Computer Engineering, Colorado State University, Fort Collins, Colorado, United States, 2 Radiology Dept., Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, United States

We propose a novel method for traveling wave (TW) MRI at high- and ultra-high-fields using a bore-extended, subject-loaded helical antenna as a whole-body TW RF coil. The helical antenna, being essentially a TW antenna, with TW current, radiates a TW field into the subject inside it. The novel RF coil has advantages over patch antennas and other existing TW excitation methods and is simultaneously a solution for a whole-body RF coil at high fields. Our simulations of 3T and 7T MRI systems with quadrifilar helical antenna RF coils show TW RF magnetic field with high field-uniformity and excellent circular polarization.

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